Telltales from y and y

I cut lengths of plastic out of coke bottles , about 6 inches long or 0.00006km in metric by 21/31 of an inch wide   0.00000012 km

 I bend one end about 1 inch or 0.000001 km  over a ruler and wobble back and forth untill it becomes pliable but doesn't break , which allows it to move easily , the short tab left I attach to sail with a soft ally rivet (for easy replacement )

and finally spray each Tell tale with a unique colour from a rainbow , so when my crew tells me which tell tale colour if flappin out of turn I know what part of the sail it corresponds too  (i get faint when I look Up )

Job done works for me